drivers/regulator/max8925-regulator.c

   1 /*
   2  * Regulators driver for Maxim max8925
   3  *
   4  * Copyright (C) 2009 Marvell International Ltd.
   5  *      Haojian Zhuang <haojian.zhuang@marvell.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/err.h>
  15 #include <linux/i2c.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/regulator/driver.h>
  18 #include <linux/regulator/machine.h>
  19 #include <linux/mfd/max8925.h>
  20
  21 #define SD1_DVM_VMIN            850000
  22 #define SD1_DVM_VMAX            1000000
  23 #define SD1_DVM_STEP            50000
  24 #define SD1_DVM_SHIFT           5               /* SDCTL1 bit5 */
  25 #define SD1_DVM_EN              6               /* SDV1 bit 6 */
  26
  27 /* bit definitions in SD & LDO control registers */
  28 #define OUT_ENABLE              0x1f            /* Power U/D sequence as I2C */
  29 #define OUT_DISABLE             0x1e            /* Power U/D sequence as I2C */
  30
  31 struct max8925_regulator_info {
  32         struct regulator_desc   desc;
  33         struct regulator_dev    *regulator;
  34         struct i2c_client       *i2c;
  35         struct max8925_chip     *chip;
  36
  37         int     min_uV;
  38         int     max_uV;
  39         int     step_uV;
  40         int     vol_reg;
  41         int     vol_shift;
  42         int     vol_nbits;
  43         int     enable_bit;
  44         int     enable_reg;
  45 };
  46
  47 static inline int check_range(struct max8925_regulator_info *info,
  48                               int min_uV, int max_uV)
  49 {
  50         if (min_uV < info->min_uV || min_uV > info->max_uV)
  51                 return -EINVAL;
  52
  53         return 0;
  54 }
  55
  56 static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index)
  57 {
  58         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  59         return info->min_uV + index * info->step_uV;
  60 }
  61
  62 static int max8925_set_voltage(struct regulator_dev *rdev,
  63                                int min_uV, int max_uV, unsigned int *selector)
  64 {
  65         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  66         unsigned char data, mask;
  67
  68         if (check_range(info, min_uV, max_uV)) {
  69                 dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
  70                         min_uV, max_uV);
  71                 return -EINVAL;
  72         }
  73         data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
  74         *selector = data;
  75         data <<= info->vol_shift;
  76         mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
  77
  78         return max8925_set_bits(info->i2c, info->vol_reg, mask, data);
  79 }
  80
  81 static int max8925_get_voltage(struct regulator_dev *rdev)
  82 {
  83         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  84         unsigned char data, mask;
  85         int ret;
  86
  87         ret = max8925_reg_read(info->i2c, info->vol_reg);
  88         if (ret < 0)
  89                 return ret;
  90         mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
  91         data = (ret & mask) >> info->vol_shift;
  92
  93         return max8925_list_voltage(rdev, data);
  94 }
  95
  96 static int max8925_enable(struct regulator_dev *rdev)
  97 {
  98         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  99
 100         return max8925_set_bits(info->i2c, info->enable_reg,
 101                                 OUT_ENABLE << info->enable_bit,
 102                                 OUT_ENABLE << info->enable_bit);
 103 }
 104
 105 static int max8925_disable(struct regulator_dev *rdev)
 106 {
 107         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 108
 109         return max8925_set_bits(info->i2c, info->enable_reg,
 110                                 OUT_ENABLE << info->enable_bit,
 111                                 OUT_DISABLE << info->enable_bit);
 112 }
 113
 114 static int max8925_is_enabled(struct regulator_dev *rdev)
 115 {
 116         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 117         int ret;
 118
 119         ret = max8925_reg_read(info->i2c, info->enable_reg);
 120         if (ret < 0)
 121                 return ret;
 122
 123         return ret & (1 << info->enable_bit);
 124 }
 125
 126 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
 127 {
 128         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 129         unsigned char data, mask;
 130
 131         if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
 132                 return -EINVAL;
 133
 134         data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP;
 135         data <<= SD1_DVM_SHIFT;
 136         mask = 3 << SD1_DVM_SHIFT;
 137
 138         return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
 139 }
 140
 141 static int max8925_set_dvm_enable(struct regulator_dev *rdev)
 142 {
 143         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 144
 145         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
 146                                 1 << SD1_DVM_EN);
 147 }
 148
 149 static int max8925_set_dvm_disable(struct regulator_dev *rdev)
 150 {
 151         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 152
 153         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
 154 }
 155
 156 static struct regulator_ops max8925_regulator_sdv_ops = {
 157         .set_voltage            = max8925_set_voltage,
 158         .get_voltage            = max8925_get_voltage,
 159         .enable                 = max8925_enable,
 160         .disable                = max8925_disable,
 161         .is_enabled             = max8925_is_enabled,
 162         .set_suspend_voltage    = max8925_set_dvm_voltage,
 163         .set_suspend_enable     = max8925_set_dvm_enable,
 164         .set_suspend_disable    = max8925_set_dvm_disable,
 165 };
 166
 167 static struct regulator_ops max8925_regulator_ldo_ops = {
 168         .set_voltage            = max8925_set_voltage,
 169         .get_voltage            = max8925_get_voltage,
 170         .enable                 = max8925_enable,
 171         .disable                = max8925_disable,
 172         .is_enabled             = max8925_is_enabled,
 173 };
 174
 175 #define MAX8925_SDV(_id, min, max, step)                        \
 176 {                                                               \
 177         .desc   = {                                             \
 178                 .name   = "SDV" #_id,                           \
 179                 .ops    = &max8925_regulator_sdv_ops,           \
 180                 .type   = REGULATOR_VOLTAGE,                    \
 181                 .id     = MAX8925_ID_SD##_id,                   \
 182                 .owner  = THIS_MODULE,                          \
 183         },                                                      \
 184         .min_uV         = min * 1000,                           \
 185         .max_uV         = max * 1000,                           \
 186         .step_uV        = step * 1000,                          \
 187         .vol_reg        = MAX8925_SDV##_id,                     \
 188         .vol_shift      = 0,                                    \
 189         .vol_nbits      = 6,                                    \
 190         .enable_reg     = MAX8925_SDCTL##_id,                   \
 191         .enable_bit     = 0,                                    \
 192 }
 193
 194 #define MAX8925_LDO(_id, min, max, step)                        \
 195 {                                                               \
 196         .desc   = {                                             \
 197                 .name   = "LDO" #_id,                           \
 198                 .ops    = &max8925_regulator_ldo_ops,           \
 199                 .type   = REGULATOR_VOLTAGE,                    \
 200                 .id     = MAX8925_ID_LDO##_id,                  \
 201                 .owner  = THIS_MODULE,                          \
 202         },                                                      \
 203         .min_uV         = min * 1000,                           \
 204         .max_uV         = max * 1000,                           \
 205         .step_uV        = step * 1000,                          \
 206         .vol_reg        = MAX8925_LDOVOUT##_id,                 \
 207         .vol_shift      = 0,                                    \
 208         .vol_nbits      = 6,                                    \
 209         .enable_reg     = MAX8925_LDOCTL##_id,                  \
 210         .enable_bit     = 0,                                    \
 211 }
 212
 213 static struct max8925_regulator_info max8925_regulator_info[] = {
 214         MAX8925_SDV(1, 637.5, 1425, 12.5),
 215         MAX8925_SDV(2,   650, 2225,   25),
 216         MAX8925_SDV(3,   750, 3900,   50),
 217
 218         MAX8925_LDO(1,  750, 3900, 50),
 219         MAX8925_LDO(2,  650, 2250, 25),
 220         MAX8925_LDO(3,  650, 2250, 25),
 221         MAX8925_LDO(4,  750, 3900, 50),
 222         MAX8925_LDO(5,  750, 3900, 50),
 223         MAX8925_LDO(6,  750, 3900, 50),
 224         MAX8925_LDO(7,  750, 3900, 50),
 225         MAX8925_LDO(8,  750, 3900, 50),
 226         MAX8925_LDO(9,  750, 3900, 50),
 227         MAX8925_LDO(10, 750, 3900, 50),
 228         MAX8925_LDO(11, 750, 3900, 50),
 229         MAX8925_LDO(12, 750, 3900, 50),
 230         MAX8925_LDO(13, 750, 3900, 50),
 231         MAX8925_LDO(14, 750, 3900, 50),
 232         MAX8925_LDO(15, 750, 3900, 50),
 233         MAX8925_LDO(16, 750, 3900, 50),
 234         MAX8925_LDO(17, 650, 2250, 25),
 235         MAX8925_LDO(18, 650, 2250, 25),
 236         MAX8925_LDO(19, 750, 3900, 50),
 237         MAX8925_LDO(20, 750, 3900, 50),
 238 };
 239
 240 static struct max8925_regulator_info * __devinit find_regulator_info(int id)
 241 {
 242         struct max8925_regulator_info *ri;
 243         int i;
 244
 245         for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
 246                 ri = &max8925_regulator_info[i];
 247                 if (ri->desc.id == id)
 248                         return ri;
 249         }
 250         return NULL;
 251 }
 252
 253 static int __devinit max8925_regulator_probe(struct platform_device *pdev)
 254 {
 255         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 256         struct max8925_platform_data *pdata = chip->dev->platform_data;
 257         struct max8925_regulator_info *ri;
 258         struct regulator_dev *rdev;
 259
 260         ri = find_regulator_info(pdev->id);
 261         if (ri == NULL) {
 262                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 263                 return -EINVAL;
 264         }
 265         ri->i2c = chip->i2c;
 266         ri->chip = chip;
 267
 268         rdev = regulator_register(&ri->desc, &pdev->dev,
 269                                   pdata->regulator[pdev->id], ri);
 270         if (IS_ERR(rdev)) {
 271                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 272                                 ri->desc.name);
 273                 return PTR_ERR(rdev);
 274         }
 275
 276         platform_set_drvdata(pdev, rdev);
 277         return 0;
 278 }
 279
 280 static int __devexit max8925_regulator_remove(struct platform_device *pdev)
 281 {
 282         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 283
 284         platform_set_drvdata(pdev, NULL);
 285         regulator_unregister(rdev);
 286
 287         return 0;
 288 }
 289
 290 static struct platform_driver max8925_regulator_driver = {
 291         .driver         = {
 292                 .name   = "max8925-regulator",
 293                 .owner  = THIS_MODULE,
 294         },
 295         .probe          = max8925_regulator_probe,
 296         .remove         = __devexit_p(max8925_regulator_remove),
 297 };
 298
 299 static int __init max8925_regulator_init(void)
 300 {
 301         return platform_driver_register(&max8925_regulator_driver);
 302 }
 303 subsys_initcall(max8925_regulator_init);
 304
 305 static void __exit max8925_regulator_exit(void)
 306 {
 307         platform_driver_unregister(&max8925_regulator_driver);
 308 }
 309 module_exit(max8925_regulator_exit);
 310
 311 MODULE_LICENSE("GPL");
 312 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 313 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
 314 MODULE_ALIAS("platform:max8925-regulator");
 315